#app{
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
.progress{
  width:120px;
  height:20px;
  border-radius: 20px;
  animation:progress 2s infinite;
  background: 
  repeating-linear-gradient(135deg, skyblue 0 10px,lightgreen 0 20px) no-repeat 0/0,
  repeating-linear-gradient(135deg, #ddd 0 10px,#eee 0 20px) 0/100%;
}
@keyframes progress {
  100% {background-size:100%}
}